Why do some people need to use a dialysis machine ? Explain the principle
involved in it.
Answers
Some people have to remain on dialysis because of their kidney failure. But they need to purify their blood and hence they depend on dialysis. It uses the principle of osmosis through a semipermeable membrane. Dialysis is a process used for removing excess water and waste from the blood.
Answer:
(i) Plants do not have specific organs to excrete the waste materials which are formed in the Metabolism.
(ii) Plants produce Carbon Dioxide (CO2) and Water (H2O) wastes in the process of Respireation. Oxygen is produced in the photosynthesis process and these Exit through Stomata of Leaves and Lenticels of Stem.
(iii) They get rid of excees water by the process of Transpiration and Guttation (the secretion of Water Droplets from the pores of plants).
(iv) The waste products may be stored in Leaves, Bark and fruits.
(v) Some of the plants waste gets stored in the fruits in the form of Solid bodies called Raphides.
Ex: Yam
(vi) Several plants prepare chemiclas and store them in Roots, Leaves, Seeds for protection against Herbivores.
(vii) The plants excrete Carbon Dioxide produced as a Waste during Respiration only at Night time.
(viii) The plants excrete Oxygen as a Wasteonly during the day time.
(ix) The plants get rid of wastes by secreting them in the form of Gums and Resins.
(x) Plants also excrete some wastes substances into the soil around them.